BURKERT Type 2933 manually operated diaphragm valve consists of a manually operated actuator, a diaphragm, and a 2-way valve body. The manual actuator with a plastic or stainless steel handwheel is available with a diaphragm bonnet made of stainless steel or plastic, ensuring reliable use in hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values and a wide range of possible applications.

The actuator has a compact, autoclavable design and is compatible with all other Bürkert diaphragm valves. The manual actuator is equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter. The manual actuator can optionally be equipped with sensors for position feedback.

Product Variants

The product family includes several body and actuator variants to suit different process requirements:

• Type 2933: 2/2-way valve body with manually operated actuator (basic).
• Type 2934: T-diaphragm valve body with manually operated actuator (basic).
• Type 2935: Tank bottom diaphragm valve with manually operated actuator (basic).
• Type 2973 / 2974 / 2975: FullFunction variants equipped with a minimum and maximum stroke limiter and a locking mechanism.

Approvals and Conformities

Depending on the selected configuration, the valves comply with stringent industry standards:

• Explosion Protection: ATEX / IECEx (Category 2 device suitable for Zone 1/21 and Zone 2/22).
• Hygiene and Food: FDA (Code of Federal Regulations), USP Class VI, EC Regulation 1935/2004, and 3-A Sanitary Standards Inc.
• Others: TA Luft (Technical instruction on air quality control).

WARNING

The ambient and medium temperature range may be limited by non-Ex-relevant specifications. Always observe the operating instructions and the specific Ex type label when operating in potentially explosive atmospheres.

Material Specifications

The valve body and diaphragms are available in all common materials and variants to meet the unique challenges of hygienic and sterile requirements.

No.	Element	Material
1	Handwheel	Polyphenylene sulphide (PPS), stainless steel 1.4308
2	Visual position indicator	Polyamide (PA), Stainless steel 1.4305
3	Valve spindle	Stainless steel 1.4305
4	Diaphragm bonnet	Stainless steel 1.4308, polyphenylene sulphide (PPS)
5	Diaphragm	EPDM (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
6	Valve body	Forged steel, Tube valve body, Cast valve body, Plastic (PVC-C, PVC-U, PP, PVDF)

Technical Data

Medium Temperature for Diaphragms

Material	Temperature Range	Sterilization
EPDM (AD)	-10...+143 °C	Steam sterilisation up to +150 °C for 60 min
FKM (FF)	0...+130 °C	No steam, dry heat up to +150 °C for 60 min
PTFE (EA)	-10...+130 °C	Steam sterilisation up to +140 °C for 60 min
Advanced PTFE (EU)	-5...+143 °C	Steam sterilisation up to +150 °C for 60 min
GYLON® (ER)	-5...+130 °C	Steam sterilisation up to +140 °C for 60 min

Maximum Permitted Medium Pressure

The values are valid for valve bodies made from plastic and stainless steel (block material, forged, cast, and tube valve body).

Diaphragm size	EPDM / FKM [bar]	PTFE / Advanced PTFE / GYLON® [bar]
8 to 40	10	10
50	7 / 10 (depending on actuator material)	7 / 10 (depending on actuator material)
65 to 80	10	10
100	6	6

Pressure Temperature Diagram for Plastic Body

This information is important for material selection. Observe the permissible operating pressure depending on the medium temperature.

Installation Notes

Self-Draining Installation

To ensure self-draining, the inclination angle of the pipeline should correspond to the valid ASME BPE recommendations. The self-draining angle (α) depends on the valve body size and the inner diameter of the port connection (DN). The marking on the port connection of the valve body serves as an orientation aid and must point upwards.

DANGER

Risk of injury due to high pressure and escaping medium. Switch off the pressure before working on the device or system. Vent or empty the lines.